From: sashiko-bot@kernel.org
To: "Arnaldo Carvalho de Melo" <acme@kernel.org>
Cc: linux-perf-users@vger.kernel.org
Subject: Re: [PATCH 5/5] perf test: Add false_sharing workload exhibiting cross-CPU false sharing
Date: Tue, 29 Sep 2026 21:28:17 +0000 [thread overview]
Message-ID: <20260929212818.05A851F000FF@smtp.kernel.org> (raw)
In-Reply-To: <20260929212246.2532021-6-acme@kernel.org>
> From: Arnaldo Carvalho de Melo <acme@redhat.com>
>
> Add a 'perf test -w false_sharing' workload that hammers one shared
> struct from several CPUs, shaped as a TCP connection: a read-mostly
> identity (five-tuple) shares a cacheline with per-packet rx counters
> (the false-sharing line), a second line has packet-path private tx and
> congestion control counters, and a third the connection config.
>
> The packet path runs in the main thread and up to four lookup threads
> hash the five-tuple and pull the config, reading one volatile shared
> instance directly so the accesses are PC-relative and resolvable by the
> data type profiler.
>
> Assisted-by: LLM
> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260929212246.2532021-1-acme@kernel.org?part=5
next prev parent reply other threads:[~2026-09-29 21:28 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-29 21:22 [PATCH v5 0/5] perf tools: Add progress diagnostics and a false-sharing workload Arnaldo Carvalho de Melo
2026-09-29 21:22 ` [PATCH 1/5] perf config: Move perf_config__set_variable() to util/config.c Arnaldo Carvalho de Melo
2026-09-29 21:45 ` sashiko-bot
2026-09-29 21:22 ` [PATCH 2/5] perf report: Add --progress option Arnaldo Carvalho de Melo
2026-09-29 21:28 ` sashiko-bot
2026-09-29 21:22 ` [PATCH 3/5] perf report: Add --no-progress option Arnaldo Carvalho de Melo
2026-09-29 21:28 ` sashiko-bot
2026-09-29 23:48 ` Namhyung Kim
2026-09-29 21:22 ` [PATCH 4/5] perf scripts: Add perf-stuck, to tell where a running perf is stuck Arnaldo Carvalho de Melo
2026-09-29 21:29 ` sashiko-bot
2026-09-29 21:22 ` [PATCH 5/5] perf test: Add false_sharing workload exhibiting cross-CPU false sharing Arnaldo Carvalho de Melo
2026-09-29 21:28 ` sashiko-bot [this message]
-- strict thread matches above, loose matches on Subject: below --
2026-09-29 20:15 [PATCH v4 0/5] perf tools: Add progress diagnostics and a false-sharing workload Arnaldo Carvalho de Melo
2026-09-29 20:15 ` [PATCH 5/5] perf test: Add false_sharing workload exhibiting cross-CPU false sharing Arnaldo Carvalho de Melo
2026-09-29 20:25 ` sashiko-bot
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